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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Variation in abundance and population dynamics of the sea-urchin Paracentrotus lividus on the Catalan coast (north-western Mediterranean Sea) in relation to habitat and marine reserve (2002)
Auteurs :	D. Lecchini, Auteur ; P. Lenfant, Auteur ; S. Planes, Auteur
Type de document :	Article
Dans :	Vie et Milieu - Life and Environment (52(2-3) septembre 2002)
Article en page(s) :	111-118
Langues:	Anglais
Résumé :	We surveyed the population structure of the sea-urchin Paracentrotus lividus, considering the impact of depth, habitat and protection on its abundance and size distribution. No difference was found between habitats (walls vs. boulders) whereas a depth gradient was highlighted for the abundance and the size distribution of the sea-urchin. Most of the population (about 80%) is located in shallow areas (less than 10 m depth) whatever the location. Shallow water populations were made of small and medium size individuals ( 50 mm in diameter). These large individuals accounted for 57% of the population in deep areas while they only represented 11% in shallow habitats. Since the recruitment in the deep waters cannot explain the abundance of large individuals, we suggest that larger individuals originate from shallow water populations, migrating to deep habitats while growing. In addition to differences linked to depth, we also observed significant differences between localities, higher abundances of sea-urchin being observed in the marine protected area than outside (193.6 vs. 82.5 ind. per 10 m(2)). However, rather than a protection effect, such result seems to be the consequence of a lower recruitment outside the protected area as the lower abundance of juveniles was observed out of the protected area. This last observation demonstrates the existence of a micro-geographic variability in the population structure of Paracentrotus lividus and much attention should be paid on this aspect prior to test the protection effect.
En ligne :	https://wwwphp.obs-banyuls.fr/Viemilieu/images/Archives_1950-2002/vie-et-milieu/VOLUME_2002_52_fasc2-3.pdf

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